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Q.

In a regular hexgon, each corner is at a distance 'r' from the centre. Identical charges of magnitude 'Q' are placed at 5 corners. The field at the centre is K=14πϵ0

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a

6kQr2

b

kQ/r2

c

Zero

d

5kQr2

answer is A.

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Detailed Solution

E→c=E1→+E2→+E3→+E4→+E5→E→c=E1→+E4→+E2→+E5→+E3→=0+0+E3→EC=E3=14πE0Qr2

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